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  • Articles  (27)
  • 1990-1994  (13)
  • 1985-1989  (14)
  • 1960-1964
  • 1955-1959
  • 1991  (13)
  • 1985  (14)
  • Physics  (27)
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  • Articles  (27)
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  • 1990-1994  (13)
  • 1985-1989  (14)
  • 1960-1964
  • 1955-1959
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  • 1
    Electronic Resource
    Electronic Resource
    Threshold behavior and electro-optical properties of twisted nematic layers with weak anchoring in the tilt and twist angle (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4211-4216 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Analytical and numerical calculations of threshold behavior and electro-optical characteristics in twisted chiral nematic layers are presented, when weak anchoring in the tilt and twist angle of the director is assumed. An analytical expression for the effective twist angle and the Fréedericksz threshold voltage is derived. In cells with bistabilities, we investigate the influence of the anchoring parameters and device parameters on the width of the hysteresis. Using the 4×4-matrix formalism of Berreman [J. Opt. Soc. Am. 62, 502 (1972)], we demonstrate the influence of the weak anchoring on the transmission-versus-voltage characteristic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349146
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  • 2
    Electronic Resource
    Electronic Resource
    Structural study of tin and carbon coimplanted silicon (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 8417-8419 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The alloy system Six(SnyC1−y)1−x was investigated. The purpose is to form material with reduced strain at silicon heterojunctions. In this work, samples were prepared by coimplantation of tin and carbon ions into silicon wafers within the dosage range 1015–1016 cm−2, followed by rapid thermal annealing. Rutherford backscattering and channeling, Auger sputter profiling, and secondary-ion-mass spectrometry were employed to study the crystallinity, chemical composition, and depth profiles. A near-perfect crystallinity for 0.5 at. % of tin and carbon was achieved. For high-dose implanted samples, tin segregation was observed. This work demonstrates promising features of group-IV semiconductor synthesis by ion implantation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347410
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  • 3
    Electronic Resource
    Electronic Resource
    GaAs-oxide removal using an electron cyclotron resonance hydrogen plasma (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1143-1145 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The surface chemistry of GaAs-oxide removal with an electron cyclotron resonance (ECR) hydrogen plasma has been investigated with x-ray photoelectron spectroscopy. It is found that As oxide is efficiently removed at room temperature, and heating expedites the removal of Ga oxide. Band bending changes during ECR hydrogen-plasma oxide reduction are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104397
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  • 4
    Electronic Resource
    Electronic Resource
    Electron density studies of KCl and LiF by γ-ray diffractometry (1985)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 41 (1985), S. 171-175 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Use of hard electromagnetic radiation (λ = 0.12 Å) in diffraction experiments, in conjunction with thin crystals in transmission geometry (Laue case), minimizes multiple scattering, often referred to as the 'extinction problem'. A large crystal slab, completely intercepting the incident beam, was used in this experiment. Several structure factors have been measured in LiF and KCl, with greater accuracy than ever before, using the γ-ray spectrometer of the University of Missouri at Columbia. In the case of LiF the results indicates some compression of the valence electron densities, similar to what has been found earlier for NaF. In the case of KCl all reflections agree well with the values calculated from free-atom Hartree-Fock wave functions except for the 004 and 006, which are appreciably weaker than corresponding reflections with similar or identical sin θ/λ values. This result indicates asphericity of the valence electron density. The 111 is also much weaker than the calculated value, indicating that the negative ions are slightly compressed and the positive ions slightly expanded with respect to the free-ion charge densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767385000344
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamics of a subconstituent picture of weak interactions (1985)
    Springer
    The European physical journal 26 (1985), S. 569-580 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We use sum rules in order to discuss the dynamics of the simplest subconstituent model of weak interactions with elementary spin 1/2 fermions and scalar bosons. Vacuum condensates of the scalars play an essential role and lead to features quite different from QCD. With a certain vacuum structure vector dominance of the composite W-mesons is a good approximation, and we also see a clear signal for massless fermions in the two-point function of composite fermions. Thus such a model is in good agreement with standard phenomenology. Composite Higgs particles are also investigated. The effective interaction is evidently of the gauge type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01551801
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  • 6
    Electronic Resource
    Electronic Resource
    Radiative corrections and the sliding singlet mechanism for light doublet higgs fields (1985)
    Springer
    The European physical journal 29 (1985), S. 166-166 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571400
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  • 7
    Electronic Resource
    Electronic Resource
    A grand unified theory based onSU(n, 1)-minimal supergravity (1985)
    Springer
    The European physical journal 29 (1985), S. 209-217 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss a grand unified theory in the framework ofSU(n, 1) minimal supergravity with the Planck mass as the only input mass scale.M W ≈m 3/2 is fixed by radiative corrections to be naturally ≪M P1. Due to the particular form of explicit soft supersymmetry breaking a light singlet can be used to obtain naturally light Higgs doublets and for a new mechanism for radiativeSU (2)×U(1) breaking. The low energy particle spectrum is very restricted withm 3/2≈104 GeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01550819
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  • 8
    Electronic Resource
    Electronic Resource
    Empty-wave effects on particle trajectories in triple-slit experiments (1991)
    Springer
    Foundations of physics 4 (1991), S. 1-17 
    Details
    ISSN: 1572-9524
    Keywords: empty waves ; trajectories ; triple slit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A numerical calculation of particle trajectories for a recently proposed triple-slit experiment has been performed by starting from the Einstein-de Broglie picture of wave-particle duality. The nonrelativistic quantum potential due to the sum of three quantum waves superimposing in space and time gives rise to an interference-like distribution of particle arrivals on a second screen that is not predicted to exist in the usual (“Copenhagen”) interpretation of quantum theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00666413
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  • 9
    Electronic Resource
    Electronic Resource
    Photofragmentation and photoabsorption cross sections for mass selected argon cluster ions,n=3 to 108 (1991)
    Springer
    The European physical journal 20 (1991), S. 33-34 
    Details
    ISSN: 1434-6079
    Keywords: 36.40. + d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A tandem time-of-flight mass spectrometer is used to measure photofragmentation mass spectra and optical absorption spectra of mass selected argon cluster ions in then=3 to 108 atoms per cluster range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543931
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  • 10
    Electronic Resource
    Electronic Resource
    Continuous reactive processing I: Reactive coating (1985)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 25 (1985), S. 541-547 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The big success of the reaction injection molding (RIM) process has brought about a marked interest in reacting polymer processing. In the present work, we study the technical feasibility of a continuous process to coat metallic conductors using reacting polymers. In the envisioned system, RIM type reactants are mixed and then injected into a tubular reactor through the center of which we pass the cable to be coated. The predictions of the mathematical model developed show that a feasible process can be designed by adequate control of the heat transfer phenomena. The process needs in general, a low reactor temperature and a high cable temperature.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760250906
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